On Sun, 29 Apr 2012 18:20:37 +0300
Avi Kivity <[email protected]> wrote:
> > - cond_resched_lock() uses spin_needbreak(), and I am not sure if
> > this still does rescheduling for alleviating mmu_lock contention
> > without CONFIG_PREEMPT.
>
> IMO that's a feature. If kernel policy is not to lockbreak when
> !CONFIG_PREEMPT, then we should follow it, whether it's the right thing
> or not. If it's the wrong thing, change it in the kernel proper.
Agreed.
Anyway, we need to alleviate mmu_lock contention on server machines, where we
usually do not select CONFIG_PREEMPT.
So I need to check the porpose of this API.
> while (1)
> need_to_read_the_code_a_bit_more();
It's a pleasure!
Thanks,
Takuya
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